Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-17
Phys. Rev. Lett. , vol. 105, 199701 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
In a recent Letter, Peets, et al. measured the x-ray intensity at the oxygen K-edge in overdoped La$_{2-x}$Sr$_x$CuO$_{4\pm\delta}$ (LSCO) and Tl$_2$Ba$_2$CuO$_{6+\delta}$. They claimed that, unlike the underdoped samples of LSCO and YBa$_2$Cu$_3$O$_x$ in which the integrated intensity increases at least linearly with doping, it saturates abruptly for a hole count exceeding $x\approx 0.23$. They interpreted the saturation as a breakdown of the 1-band Hubbard model in the cuprates. However, we show that their results are in quantitative agreement with the 1-band Hubbard model.
Jarrell Mark
Phillips Philip
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